Recent epidemiological studies suggest that short sleep duration may be associated
with the development of obesity from childhood to adulthood.
To assess whether the evidence supports the presence of a relationship between short
sleep duration and obesity at different ages, and to obtain an estimate of the risk.
We performed a systematic search of publications using MEDLINE (1996-2007 wk 40),
EMBASE (from 1988), AMED (from 1985), CINHAL (from 1982) and PsycINFO (from 1985)
and manual searches without language restrictions. When necessary, authors were contacted.
Criteria for inclusion were: report of duration of sleep as exposure, BMI as continuous
outcome and prevalence of obesity as categorical outcome, number of participants,
age, and gender. Results were pooled using a random effect model. Sensitivity analysis
was performed, heterogeneity and publication bias were also checked. Results are expressed
as pooled odds ratios (OR [95% confidence intervals, CIs]) and as pooled regression
coefficients (beta; 95% CIs).
Of 696 studies identified, 45 met the inclusion criteria (19 in children and 26 in
adults) and 30 (12 and 18, respectively) were pooled in the meta-analysis for a total
of 36 population samples. They included 634,511 participants (30,002 children and
604,509 adults) from around the world. Age ranged from 2 to 102 years and included
boys, girls, men and women. In children the pooled OR for short duration of sleep
and obesity was 1.89 (1.46 to 2.43; P < 0.0001). In adults the pooled OR was 1.55
(1.43 to 1.68; P < 0.0001). There was no evidence of publication bias. In adults,
the pooled beta for short sleep duration was -0.35 (-0.57 to -0.12) unit change in
BMI per hour of sleep change.
Cross-sectional studies from around the world show a consistent increased risk of
obesity amongst short sleepers in children and adults. Causal inference is difficult
due to lack of control for important confounders and inconsistent evidence of temporal
sequence in prospective studies.